lib/sorcery/providers/facebook.rb
module Sorcery
module Providers
# This class adds support for OAuth with facebook.com.
#
# config.facebook.key = <key>
# config.facebook.secret = <secret>
# ...
#
class Facebook < Base
include Protocols::Oauth2
attr_reader :mode, :param_name, :parse
attr_accessor :access_permissions, :display, :scope, :token_url,
:user_info_path, :auth_path, :api_version
def initialize
super
@site = 'https://graph.facebook.com'
@auth_site = 'https://www.facebook.com'
@user_info_path = 'me'
@scope = 'email'
@display = 'page'
@token_url = 'oauth/access_token'
@auth_path = 'dialog/oauth'
@mode = :query
@parse = :query
@param_name = 'access_token'
end
def get_user_hash(access_token)
response = access_token.get(user_info_path)
auth_hash(access_token).tap do |h|
h[:user_info] = JSON.parse(response.body)
h[:uid] = h[:user_info]['id']
end
end
# calculates and returns the url to which the user should be redirected,
# to get authenticated at the external provider's site.
def login_url(params, session)
authorize_url
end
# overrides oauth2#authorize_url to allow customized scope.
def authorize_url
# Fix: replace default oauth2 options, specially to prevent the Faraday gem which
# concatenates with "/", removing the Facebook api version
options = {
site: File::join(@site, api_version.to_s),
authorize_url: File::join(@auth_site, api_version.to_s, auth_path),
token_url: token_url
}
@scope = access_permissions.present? ? access_permissions.join(',') : scope
super(options)
end
# tries to login the user from access token
def process_callback(params, session)
args = {}.tap do |a|
a[:code] = params[:code] if params[:code]
end
get_access_token(args, token_url: token_url, mode: mode,
param_name: param_name, parse: parse)
end
end
end
end